Objective The aim of this study was to investigate whether the characteristics of residents and professional caregivers are associated with the professionals' expressed emotion (EE). Method Fifty-six residents in sheltered living who suffer from schizophrenia or a related psychotic disorder and their professional caregivers were enlisted. Standardised validated instruments were used to measure EE, the residents' social functioning, symptoms and social network size, and the professional caregivers' coping strategies and personality. Results There was strong evidence that high EE was associated with the residents' age, poorer social functioning and smaller network sizes. There was no significant relationship between EE and the residents' symptoms except for excitement. Concerning the professional caregivers, high EE professionals were less open than their low EE colleagues and had a lower education level. Conclusion The residents' social functioning is an important correlate of the EE index.